private static void TestShuffleAlgorithm(IShuffleAlgorithm algo, bool forward)
{
for (int i = 1; i < 1000; i++)
{
var checkNumbers = new BitArray(i, false);
algo.Length = i;
algo.Seed = i;
for (int j = 0; j < i; j++)
{
if (forward)
{
algo.Next();
}
else
{
algo.Prev();
}
int shufNum = algo.Index;
if (checkNumbers.Get(shufNum))
{
Assert.Fail("Duplicate number");
}
checkNumbers.Set(shufNum, true);
}
}
}
private PlaylistItem NPMove(sbyte off)
{
if (freeList.Count == 0)
{
return(null);
}
indexCount += Math.Sign(off);
if (Loop)
{
indexCount = Util.MathMod(indexCount, freeList.Count);
}
else if (indexCount < 0 || indexCount >= freeList.Count)
{
indexCount = Math.Max(indexCount, 0);
indexCount = Math.Min(indexCount, freeList.Count);
return(null);
}
if (Random)
{
if (dataSetLength != freeList.Count)
{
dataSetLength = freeList.Count;
shuffle.Length = dataSetLength;
}
if (off > 0)
{
shuffle.Next();
}
if (off < 0)
{
shuffle.Prev();
}
}
if (Index < 0)
{
return(null);
}
var entry = freeList.GetResource(Index);
if (entry == null)
{
return(null);
}
entry.Meta.FromPlaylist = true;
return(entry);
}
